sin(x+30)*cos(x+45)
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sin(x+30)*cos(x+45)
求值:sin(x+30度)*cos(x+45度)*csc(45度-x)*tg(60度+x)*tg(30度-x)*sec(60度-x)
x没给!
求值:sin(x+30度)*cos(x+45度)*csc(45度-x)*tg(60度+x)*tg(30度-x)*sec(60度-x)
x没给!
sin(x+30度)*cos(x+45度)*csc(45度-x)*tg(60度+x)*tg(30度-x)*sec(60度-x)
=sin(x+30度)*cos(x+45度)*[1/sin(45度-x)]*[tg(60度+x)*ctg(60度+x)]*[1/cos(60度-x)]
=sin(x+30度)*cos(x+45度)*[1/cos(45度+x)]*1*[1/sin(30度+x)]
=1
=sin(x+30度)*cos(x+45度)*[1/sin(45度-x)]*[tg(60度+x)*ctg(60度+x)]*[1/cos(60度-x)]
=sin(x+30度)*cos(x+45度)*[1/cos(45度+x)]*1*[1/sin(30度+x)]
=1
sin(x+30)*cos(x+45)
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证明sin^2(x)+cos^2(x+30)+sin(x)cos(x+30)=3/4
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